Leviticus is Israel's handbook for holy living in the presence of a holy God. It details the sacrificial system, priestly duties, dietary and purity laws, and the festivals — all teaching that sin requires atonement and that God's people are called to be set apart.
“For I am the LORD your God: ye shall therefore sanctify yourselves, and ye shall be holy; for I am holy.”
“For the life of the flesh is in the blood: and I have given it to you upon the altar to make an atonement for your souls.”
“Thou shalt not avenge, nor bear any grudge against the children of thy people, but thou shalt love thy neighbour as thyself: I am the LORD.”